as引導的讓步狀語從句一定要用虛擬語氣嗎

as用于引導讓步狀語從句，只能用于倒裝句式，并且通常可換成though（但不能是although），其基本結構是“名詞、形容詞、副詞、動詞等+as [though]+主語+其他”。這類句子通常用陳述語氣。如：

Rich as he is, he is not happy. 盡管他很富有，他并不幸福。

Boy as he was, he behaved like a girl. 他雖是個男孩，但舉止卻像個女孩。

Much as I like you, I couldn't live with you. 我盡管很喜歡你, 卻不能和你在一起生活。

Lose money as I did, I got a lot of experience. 錢雖然丟了，我們卻得到了許多經驗。

Hard though they tried, they couldn't make her change her mind. 盡管他們做了很大努力，卻沒法讓她改變主意。

但有時從句也用“may [might, would]+動詞原形”這樣的虛擬語氣。如：

Clever as you may be, you cannot do that. 盡管你聰明，你卻做不了這件事。

Strange though it may seem, he arrived early. 盡管看來很奇怪，他卻到得很早。

Try as she might, she could not persuade her friends to go. 不管她怎樣想法，都不能勸說她的朋友們去。